Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description must carry the full burden of behavioral disclosure. It discloses a key safety behavior ('Reports redact values and never echo secrets') and a scope constraint ('Local .env files only'). However, it does not explicitly state whether the tool is read-only, how it handles errors, or what the output format is beyond being a 'report'. The redaction guarantee is valuable, but the description could be more complete about side effects and output.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is two sentences with no redundant words. It front-loads the core purpose ('Compare .env.example vs .env for missing and extra keys; list empty required keys'), then adds the constraint and safety guarantee. Every word earns its place, and the structure is clear and scannable.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given the absence of an output schema and annotations, the description should provide more detail about the tool's return value and behavior. It says 'Reports redact values' but does not specify the structure of the report (e.g., sections for missing, extra, empty keys) or how results are presented. It also omits error-handling behavior. While the description covers the core function and safety, it leaves ambiguity about the exact output an agent would need to interpret.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The input schema provides descriptions for all three parameters (envPath, examplePath, includeCommentedExample) with 100% coverage, so the baseline is 3. The tool description does not add any additional parameter-specific meaning beyond what the schema already states; it only reinforces overall tool behavior (e.g., 'list empty required keys') without enriching the understanding of any individual parameter.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's function: compare two env files for missing and extra keys, and list empty required keys. It uses a specific verb ('Compare') and resource ('.env.example vs .env'), and the mention of 'list empty required keys' differentiates it from sibling tools like detect_empty_required, which likely focuses solely on empty keys, and redact_env_report, which likely produces a redacted report.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description provides a constraint ('Local .env files only') but gives no guidance on when to choose this tool over the sibling tools (detect_empty_required, redact_env_report). There is no explicit 'use this instead of X when...' or mention of alternatives, leaving the agent to infer the appropriate context from the tool's purpose.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden, and it uses that room to state that values are redacted, reports redact values, and secrets are never echoed. That is important, safety-relevant behavior. It stops short of saying whether the tool writes or modifies files, but 'detect' and 'reports' imply a read-only operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is short and front-loads the main purpose, but 'Values redacted' is then repeated as 'Reports redact values and never echo secrets', so the redaction point is made three times. It is compact but not maximally efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema and no annotations, so the description needs to explain the tool's behavior, return/report nature, and parameter roles more fully. It covers redaction and the source of required keys, but includeCommentedExample is never explained and the report format is not described.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is only 25%, with envPath, examplePath, and includeCommentedExample lacking descriptions. The prose clarifies that required keys can come from an example file or requiredKeys, which helps, but it leaves the meaning of includeCommentedExample and the role of envPath mostly implicit.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific operation (detect missing or empty required vars) and the two sources that define 'required' (example file or explicit requiredKeys). That is enough to separate it from compare_env_files and redact_env_report, which clearly do different jobs.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description restricts the tool to local .env files but gives no guidance on when to choose this tool over its siblings. It never mentions compare_env_files or redact_env_report, so an agent has to infer the boundary from the names.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the behavioral burden. It explicitly states that values are redacted and that it 'never echo secrets', which is a valuable safety guarantee. However, it does not describe the exact report format or side effects, though the name implies a read-only operation.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two sentences with the main purpose front-loaded. There is some redundancy between 'all values redacted' and 'Reports redact values', but overall the description is compact and efficient.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

The tool has one optional parameter and no output schema, and the description explains the general behavior and safety guarantees. However, it does not specify the output format, error handling, or conditions under which the tool might fail, leaving some gaps for an agent to infer.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, and envPath is documented in the schema. The description adds only the 'Local .env files only' constraint, which is a minor semantic addition rather than a full description of the parameter's meaning.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Produce') and a distinct artifact ('paste-safe inventory of keys in an env file with all values redacted'). It clearly differentiates from siblings 'compare_env_files' and 'detect_empty_required', which serve other purposes.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives a usage constraint with 'Local .env files only', but does not explicitly explain when to use this tool over alternatives or mention the sibling tools. No when-to-use or when-not-to-use guidance is provided.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.